Mechanical movement.



No. 699,823. Patented May '3, I902.

J. W. SHARRARD & T. W. LLOYD. MECHANICAL MOVEMENT.

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JAMES XV. SIIARRARD AND THOMAS \V. LLOYD, OF ATCHISON, KANSAS.

MECHANiCAL MOVEMENT.

SPECIFICATION forming part of Letters Patent No. 699,823, dated May 13, 1902,

Application filed February 26, 190]. Serial No. 48,983. (No modelfi! To (0 whom it may concern.-

Be it known that we, J AMES W. SHARRARD and THOMAS V. LLOYD, citizens of the Uu ited States, and residents of Atchison, in the county of Atchison and State of Kansas, have invented a certain new and useful Mechanical Movement, of which the following is a specification.

Our invention relates primarily to mechanism by which a continuous rotary motionsuch, for instance, as obtained from a windwheel-may be translated into a reciprocating motionsuch, for instance, as that employed in operating the sucker of a pumpthe objects of our invention being to provide a mechanism of simple and durable construction that will increase the power of the driving-shaft over that obtainable from a simple cam, reducing the time of reciprocation of the lever, and to obtain a reciprocating movement which, measured by the revolution of the driving-shaft, has a gradual start, an accelerating rise, and a quick but retarding return movement. Theseobjectsareattained by mechanism hereinafter fully described, and particularly pointed out in the claims, reference being had to the accompanying drawings, in which Figures 1, 2, and 3 are end elevations of our improved mechanism, each of which shows the rider-wheel on a diiferent one of three cam-disks of a compound cam. Fig. 4: is a plan view of mechanism shown in Figs. 1, 2, and 3. Figs. 5 and 6 are perspective views, respectively, of the peculiar form of rider-wheel having offsets in its periphery and of the compound cam upon which said wheel travels. Fig. 7is a diagram of the compound cam, showing the spiral connection between the periphery of each cam and the one next in size, also designating the efficiency of each cam-disk or the distance the wheel is raised by each half-revolution of the compound cam and a comparison between the throw of the several cam-disks, which together produce a gradual reverse at the lower limit, an accelerating rise, and a retarding return of the reciprocating member.

For purposes of eXplanationwe shall describe our invention in connection with a windmill; but we desire it understood that our invention is applicable to any use requiring the particular translation of motion mentioned.

Referring to the drawings, 1 represents a suitable mounting, in which a vertically-reciprocating lever 2 is horizontally fulcrumed at 3. The lever 2 has a rider-wheel-i, journaled at 5 in its outer end.

(3 represents a connection to be reciprocated to perform work-as, for instance, the plunger of a windmill to be connected with the suckerrod of a pump. This plunger 6 is connected at 7 to the lever 2, and consequentlyreceives any motion imparted to the latter. By varying the distance between the points 7 and 5 the amplitude of the plungers movement may be varied.

8 represents a shaft to which constant rotation is imparted-as, for instance, by a wind-wheel suitably connected therewith.

9 represents a peeuliarly-constructed cam fixed to rotate with shaft 8. The cam 9 is com pounded in such a manner that more than one revolution of the cam is required to raise or lower the lever 2, such compounding being accomplished by inountinga plurality of camdisks 10 ll 12 coaxially though eccentrieally on the cam-shaft 8 and, as seen in Fig. 7, with the salient point of cam-disk 1O merging spirally at x with the neutral point of the camdisk 11 and salient point of cam-disk 11 similarly merging at y with the neutral point of cam-disk 12, so that the rider-wheel t, which rests constantly over the cam-shaft 8, travels from the periphery of one cam-disk to another, and neutral point to of cam-disk 10 and salient point z of cam-disk 12 are reversingpoints. These reversing-points and points of merger occur at different circumferential points in the cam. The object of this is to permit the rider-wheel or other bearing medium through which the cam acts upon the lever to shift from one cam to another Without waiting for a complete revolution of the cam, as would be the case if the cams were all in the same radial line. As shown in the drawings, the points of merger are all located in one diameter alternately on opposite sides of the center of revolution, so that the shifting of one disk to another disk takes place at each half-revolution. It is obvious, however, that these points of merger might be changed. Starting at the neutral point to of the smallest cam-disk 10, a half-revolution of the camshaft brings the rider-wheel 4: to 00, another half-revolution brings said wheel to 1 and a third half-revolution brings the wheel to the highest point 2, after which continued halfrevolutions cause the wheel to descend again successively to the points y, :0, and 'w. Thus three revolutions of the cam are necessary to produce one stroke of the plunger, and the cam-shaft gains power at the expense of speed. By multiplying or diminishing the number of cam-disks this relation may be changed at will. Again, if we observe the relations between the eccentricity of the several cam-disks we find that the cam-disk 1O raises the rider-Wheel the distance a, Fig. 7, the cam-disk 11 raises it the distance I), and the cam-disk 12 raises it the distance 0; but while these distances are traversed each in the same interval of time (measured by a half-revolution of shaft 8) the distances gradually increase as the wheel climbs up and gradually diminish as the wheel descends. Hence we have an accelerating ascending motion and a retarding descending motion, or a quick lift and a quick return,while the lower reversing-point is very gradual. This is especially advantageous in pumping, in that the motion is slow While the water is passing the sucker and the valves are seating and While the column of water is being started; but these steps accomplished the final throw and return are rapid.

In order that the rider-wheel may readily pass from one to the other of the differentsized cam-disks 10 11 12, the periphery of the rider-wheel is formed with lateral offsets 10 11 12, so as to bring the several parts of the periphery in different planes corresponding to the planes of the cam-disks. The offsets 10 and 12 measure the entire perimeter of their corresponding disks '10 and 12, upon which they bear, while the offsets 11 each measure one-half of the perimeter of the camdisk 11. The recesses behind the offsets receive the several rear disks as the wheel drops below their peripheries in running upon the one in front of it. The offsets, as shown, occur in the order in which they oncounter the cam-disks. There are as many intermediate offsets as there are intermediate cam-disks. In the example shown there are two offsets ll in the periphery of wheel 4:, W because there is one intermediate cam-disk '11, and this is encountered at each end of both ofli'sets 10 and 12 Having thus described our invention, the

following is what we claim as new therein and desire to secure by Letters Patent:

1. Ina mechanical movement, a cam embodying three cam-disks of varying sizes arranged each with its salient point coincident with the neutral point of the next disk and with the points of merger at different circumferential points in the cam whereby a machine element cooperating with said cam travels from one to the other of the disks and changes from one to the other at periods less than a complete revolution of the cam.

2. A mechanical movement comprising a cooperating member suitably mounted, and a cam with which said member cooperates made up of three or more cam-disks eccentric to the shaft, arranged so that the neutral point of one disk merges with the salient point of the next disk, and with said points of merger arranged in the same diametric line and alternately on opposite sides of the center of revolution, so that the cooperating member travels from one disk to another, and its periods of reversing or shifting when traveling from one extreme of the cam to the other, occur at half-revolutions of the cam.

3. A mechanical movement comprising a suitably-fulcrumed lever arranged to perform Work, a rotating shaft, a compound cam made up of a plurality of cam-disks coaxially but eccentrically fixed to said shaft in difierent planes, and a rider-wheel carried by the lever, adapted to bear upon the cam, and having its periphery otfset to operate in the planes of the cam-disks the portions of the periphery of said rider-wheel which encounter the respective disks.

4. In a mechanical movement the combination of the mounting 1, the lever 2 horizontally fulcrumed in said mounting, a riderwheel 4 at the outer end of said lever, the plunger 6 connected to said lever 2, a constantly-rotating shaft 8 and a compound cam 9 composed of a plurality of coaxial, eccentrio cam-disks, in different planes, the periphery of the riderwheel being offset to bring the portions of its rim into the planes of the cam-disks encountered thereby.

The foregoingspecification signed at Atchison, Kansas, this 21st day of February, 1901.

JAMES \V. SHARRARD. THOMAS \V. LLOYD.

In presence of Z. E. JACKSON, W. A. JACKSON. 

